Year in review in Intensive Care Medicine 2009. Part III: mechanical ventilation, acute lung injury and respiratory distress syndrome, pediatrics, ethics, and miscellanea

Transferring home to die from critical care units: A scoping review of international practices

PURPOSE

To identify and characterise the international practices of transferring a dying patient home to die from critical care units.

MATERIALS AND METHODS

A systematic scoping review following the Joanne Briggs Institute methodology was applied searching fifteen data sources to identify papers published in English and Chinese from 1970 to 2019.

RESULTS

Of the 28 papers meeting eligibility criteria 19 were published in the West and seven in China. The number of patients being transferred home to die was larger in China (74/184-96/159) than in the West (1-7). Clinical characteristics of patients transferred included: consciousness, with or without intubation and ventilation, and clinical stability. Reported key barriers to transfer included: Lack of evidence guiding transfer practice, the CCU environment and culture, Practical and logistical factors and Family members expectations and reactions. Key facilitators of transfer were reported as: Engagement with the multidisciplinary team and Personal patient and family wishes.

CONCLUSIONS

Transferring patients home to die from critical care is a complex practice varying significantly across countries. Further research to address current knowledge gaps is important to inform policy and practice.

Impact of ventilation-induced lung injury on the structure and function of lamellar bodies

Alterations to the pulmonary surfactant system have been observed consistently in ventilation-induced lung injury (VILI) including composition changes and impairments in the surface tension reducing ability of the isolated extracellular surfactant. However, there is limited information about the effects of VILI on the intracellular form of surfactant, the lamellar body. It is hypothesized that VILI leads to alterations of lamellar body numbers and function. To test this hypothesis, rats were randomized to one of three groups, nonventilated controls, control ventilation, and high tidal volume ventilation (VILI). Following physiological assessment to confirm lung injury, isolated lamellar bodies were tested for surfactant function on a constrained sessile drop surfactometer. A separate cohort of animals was used to fix the lungs followed by examination of lamellar body numbers and morphology using transmission electron microscopy. The results showed an impaired ability of reducing surface tension for the lamellar bodies isolated from the VILI group as compared with the two other groups. The morphological assessment revealed that the number, and the relative area covered by, lamellar bodies were significantly decreased in animals with VILI animals as compared with the other groups. It is concluded that VILI causes significant alterations to lamellar bodies. It is speculated that increased secretion causes a depletion of lamellar bodies that cannot be compensated by de novo synthesis of surfactant in these injured lungs.

Noninvasive Positive-Pressure Ventilation in Acute Respiratory Distress Syndrome in Patients With Acute Pancreatitis: A Retrospective Cohort Study

OBJECTIVES

Noninvasive positive-pressure ventilation (NPPV) in acute respiratory distress syndrome (ARDS) is controversial. We aimed to assess the efficacy of NPPV on ARDS in acute pancreatitis (AP).

METHODS

In this retrospective, single-center cohort study, demographic data, clinical and biochemical parameters of AP and developed ARDS on admission as well as before and after use of NPPV, and clinical outcomes were retrieved from the medical record database. Degrees of ARDS at presentation were retrospectively classified using the Berlin Definition.

RESULTS

Of 379 patients identified, 127 were eligible for inclusion and had NPPV for more than 24 hours. There were 44 mild, 64 moderate, and 19 severe patients with ARDS at presentation; endotracheal intubation rates were 0% (0/44), 23.4% (15/64), and 47.4% (9/19); and the mortality rates were 0% (0/44), 9.4% (6/64), and 15.8% (3/19), respectively. After NPPV treatment, systolic pressure, heart rate, respiratory rate, and fraction of inspired oxygen decreased, whereas oxygen saturation increased significantly in the NPPV success group compared with the failed group. Similar findings were also observed between survivors and nonsurvivors.

CONCLUSIONS

Noninvasive positive-pressure ventilation may be an effective option for the initial treatment of ARDS patients in AP, but the use of NPPV should be applied prudently in the most severe cases.

Differential Effects of Endotracheal Suctioning on Gas Exchanges in Patients with Acute Respiratory Failure under Pressure-Controlled and Volume-Controlled Ventilation

This study was conducted to evaluate the effects of open endotracheal suctioning on gas exchange and respiratory mechanics in ARF patients under the modes of PCV or VCV. Ninety-six ARF patients were treated with open endotracheal suctioning and their variations in respiratory mechanics and gas exchange after the suctions were compared. Under PCV mode, compared with the initial level of tidal volume (V_T), ARF patients showed 30.0% and 27.8% decrease at 1 min and 10 min, respectively. Furthermore, the initial respiratory system compliance (C_rs) decreased by 29.6% and 28.5% at 1 min and 10 min, respectively. Under VCV mode, compared with the initial level, 38.6% and 37.5% increase in peak airway pressure (PAP) were found at 1 min and 10 min, respectively. Under PCV mode, the initial PaO₂ increased by 6.4% and 10.2 % at 3 min and 10 min, respectively, while 18.9% and 30.6% increase of the initial PaO₂ were observed under VCV mode. Summarily, endotracheal suctioning may impair gas exchange and decrease lung compliance in ARF patients receiving mechanical ventilation under both PCV and VCV modes, but endotracheal suctioning effects on gas exchange were more severe and longer-lasting under PCV mode than VCV.

Noninvasive positive pressure ventilation for the treatment of acute respiratory distress syndrome following esophagectomy for esophageal cancer: a clinical comparative study

OBJECTIVE

To evaluate the therapeutic efficacy of noninvasive positive pressure ventilation (NPPV) in the treatment of acute respiratory distress syndrome (ARDS) following esophagectomy for esophageal cancer.

METHODS

In this retrospective evaluation, we included 64 patients with ARDS following esophagectomy for esophageal cancer between January 2009 and December 2011. The primary evaluations were 28-day fatality and actual fatality. The secondary evaluations were sex, age, onset time, pH value, PaO2/FiO2, sequential organ failure assessment (SOFA) score, acute physiology and chronic health evaluation (APACHE-II) score, and presence or absence after surgery of major surgery-related complications such as cardiac arrest, anastomotic fistula, and acute renal dysfunction.

RESULTS

NPPV applied as the first-line intervention for ARDS following esophagectomy for esophageal cancer avoided intubation in 30 patients (30/64, 48.4%). There were no significant differences in gender, age, PaO2/FiO2, SOFA score, or APACHE-II score between the NPPV group and the patients who required invasive positive pressure ventilation (IPPV group) (P>0.05) at the time of onset, while differences in the PaO2/FiO2 (P<0.05) after 24 h of NPPV and presence of major surgery-related complications were highly significant (P<0.01).

CONCLUSIONS

NPPV may be an effective option for the treatment of ARDS/acute lung injury (ALI) following esophagectomy for esophageal cancer. However, conversion to invasive mechanical ventilation should be considered in patients with severe postoperative complications such as acute renal dysfunction and cardiac arrest and in those with PaO2/FiO2 <180 after 2 h of NPPV.

"It hurts to know... and it helps": exploring how surrogates in the ICU cope with prognostic information

BACKGROUND

Surrogates of critically ill patients in the intensive care unit (ICU) want honest prognostic information, but they also want to hear good news. There has been little examination of how surrogates navigate these dual needs or how clinicians should respond.

OBJECTIVE

The aim of this study was explore how surrogates in the ICU experience and cope with prognostic information and describe their recommendations for clinicians.

METHODS

We conducted a qualitative interview study with 30 surrogates facing life-sustaining treatment decisions in five ICUs in Pittsburgh, Pennsylvania. In-depth, semi-structured interviews with surrogates in the ICU focused on general experiences, emotional needs, informational needs, and recommendations for clinicians. We inductively analyzed transcripts for key themes using constant comparative methods.

RESULTS

Surrogates experience a tension between wanting to know what to expect and needing to remain hopeful. This tension underlies their experience receiving prognostic information and may lead to behaviors that allow continued hope in the face of bad news, including: 1) focusing on small details rather than the big picture, 2) relying on gut instincts or personal beliefs about the patient, 3) seeking more positive prognostic information from other sources, and, for a minority, 4) avoiding or disbelieving prognostic information. Surrogates emphasize the importance of frequent communication and call on physicians to gently help them prepare for the worst and hope for the best.

CONCLUSIONS

Surrogates in the ICU experience conflicting emotional and informational needs. They describe behaviors that give the appearance of avoiding bad news while simultaneously asking physicians to help them cope with prognostic information.

Association between physicians' beliefs and the option of comfort care for critically ill patients

PURPOSE

For critically ill patients at high risk of death, reasonable treatment options include attempts at life prolongation and treatment focused on comfort. Little is known about whether and how physicians present the option of comfort care to surrogates. This study assessed how comfort care is presented to surrogates and whether physicians' beliefs are associated with whether comfort care is presented as an option.

METHODS

Mixed-methods study of 72 audio-recorded family conferences about treatment decisions in five ICUs at two hospitals in San Francisco, California. One hundred sixty-nine family members and 54 physicians participated. Patients were at high risk of death or severe functional impairment. Transcripts of audio-recorded conferences were coded to identify whether physicians offered comfort care as an alternative to life-sustaining treatment and to characterize the stated risks and benefits. Physicians completed a questionnaire indicating the strength of their belief that life support should be foregone.

RESULTS

The inpatient mortality rate was 72 %. Using a broad definition of comfort-oriented treatment, this option was presented in 56 % (95 % CI, 44-67 %) of conferences. In clustered multivariate models, the only independent predictor of offering comfort care as an option was the strength of the physician's belief that life support should be foregone [OR 1.38 (1.14-1.66), p = 0.01].

CONCLUSIONS

Clinicians did not explicitly inform surrogates about the option of comfort-oriented treatment in roughly half of clinician-family meetings. Physicians who more strongly believe that the appropriate goal of care is life prolongation are less likely to inform surrogates about the option of comfort care.

Non-invasive ventilation in immunosuppressed patients with pneumonia and extrapulmonary sepsis

PURPOSE

International guidelines recommend the use of noninvasive ventilation in immunocompromised patients with acute respiratory failure (ARF). We analyzed failure rates and risk factors for NIV failure in immunocompromised patients.

METHODS

We retrospectively analyzed 120 immunodeficient patients treated with NIV in our medical ICU from 2005 to 2011. We compared the clinical course and NIV failure rates. Furthermore, we compared patients with secondary respiratory failure due to those with Systemic Inflammatory Response Syndrome (SIRS) of other than pulmonary origin to those with primary pulmonary infiltrations.

RESULTS

Regression analyses revealed high APACHE II score (p < 0.01), need for catecholamines (p < 0.05) and low paO(2)/FIO(2) ratio (p < 0.05) as risk factors for NIV failure. Regarding the underlying diseases, we could not find differences in NIV duration (p = 0.07) and outcome (p = 0.44). 59.2% suffered from ARF due to lung infiltrations whereas 40.8% had secondary ARF caused by sepsis of extrapulmonary origin. Patients with lung infiltrations had a longer stay on ICU (16.3 vs 13.2 days; p = 0.047) and showed a trend toward longer NIV duration (87 ± 102 h vs 65.6 ± 97.8 h; p = 0.056). The SIRS patients compared to pneumonia patients showed a trend toward higher serum creatinine (1.63 mg/dL to 1.51 mg/dL; p = 0.059), a higher rate of renal failure (p < 0.01), higher APACHE II score (30.6-25.7, p < 0.01) and more frequently needed catecholamines (p < 0.01). NIV failure rate (overall 55%) was not different.

CONCLUSIONS

Almost 50% of the immunocompromised patients treated with NIV did not require intubation independent of the etiology of ARF. High APACHE II scores and severity of oxygenation failure were associated with NIV failure.

Discontinuation of prolonged infusions of dexmedetomidine in critically ill children with heart disease

PURPOSE

To describe changes in hemodynamic variables, sedation, and pain score after discontinuation of prolonged infusions of dexmedetomidine in a pediatric population of critically ill cardiac patients.

METHODS

Retrospective case series of patients who received continuous infusions of dexmedetomidine for longer than 3 days in a pediatric cardiac intensive care unit from 2008 to 2010.

RESULTS

Sixty-two patients, age 5.2 months (range 0.3 months-17 years) and weight 5.1 kg (range 2.2-84 kg), were included. Thirty-nine patients (63%) were younger than 1 year of age. Median duration of dexmedetomidine infusion was 5.8 days (range 4-26 days) and median infusion dose was 0.71 μg/kg/h (range 0.2-2.1 μg/kg/h). Median weaning time and dose at discontinuation were 43 h (range 0-189 h) and 0.2 μg/kg/h (range 0.1-1.3 μg/kg/h). Tachycardia, transient hypertension and agitation were observed in 27, 35 and 27% of patients. Episodes of tachycardia were more frequent in children older than 1 year of age (61 vs. 8%, p < 0.001), patients who received dexmedetomidine for 4 days when compared to those who received 5 days or longer (48 vs. 17%, p = 0.011), and patients whose infusion was discontinued abruptly (42 vs. 14%, p = 0.045). Tachyarrhythmias were seen in nine patients (15%) after discontinuation of the dexmedetomidine infusion. Adequate sedation and analgesia scores at the moment of infusion discontinuation were seen in 90 and 88% of patients, respectively.

CONCLUSIONS

Our study suggests that tachycardia, transient hypertension, and agitation are frequently observed in pediatric cardiac intensive care unit patients after discontinuing prolonged dexmedetomidine infusions.

Impact of an intensive communication strategy on end-of-life practices in the intensive care unit

PURPOSE

Since the 2005 French law on end of life and patients' rights, it is unclear whether practices have evolved. We investigated whether an intensive communication strategy based on this law would influence practices in terms of withholding and withdrawing treatment (WWT), and outcome of patients hospitalised in intensive care (ICU).

METHODS

This was a single-centre, two-period study performed before and after the 2005 law. Between these periods, an intensive strategy for communication was developed and implemented, comprising regular meetings and modalities for WWT. We examined medical records of all patients who died in the ICU or in hospital during both periods.

RESULTS

In total, out of 2,478 patients admitted in period 1, 678 (27%) died in the ICU and 823/2,940 (28%) in period 2. In period 1, among patients who died in the ICU, 45% died subsequent to a decision to WWT versus 85% in period 2 (p < 0.01). Among these, median time delay between ICU admission and initiation of decision-making process was significantly different (6-7 days in period 1 vs. 3-5 days in period 2, p < 0.05). Similarly, median time from admission to actual WWT decision was significantly shorter in period 2 (11-13 days in period 1 vs. 4-6 days in period 2, p < 0.05). Finally, median time from admission to death in the ICU subsequent to a decision to WWT was 13-15 days in period 1 versus 7-8 days in period 2, p < 0.05. Reasons for WWT were not significantly different between periods.

CONCLUSION

Intensive communication brings about quicker end-of-life decision-making in the ICU. The new law has the advantage of providing a legal framework.

A qualitative study exploring the experiences of parents of children admitted to seven Dutch pediatric intensive care units

PURPOSE

To explore parents' experiences during the admission of their children to a pediatric intensive care unit (PICU).

METHOD

Qualitative method using in-depth interviews. Thematic analysis was applied to capture parents' experiences. Thirty-nine mothers and 25 fathers of 41 children admitted to seven of the eight PICUs in university medical centers in The Netherlands were interviewed.

RESULTS

Parents were interviewed within 1 month after their child's discharge from a PICU. Thematic analysis identified 1,514 quotations that were coded into 63 subthemes. The subthemes were categorized into six major themes: attitude of the professionals; coordination of care; emotional intensity; information management; environmental factors; parent participation. Most themes had an overarching relationship representing the array of experiences encountered by parents when their child was staying in a PICU. The theme of emotional intensity was in particular associated with all the other themes.

CONCLUSIONS

The findings provided a range of themes and subthemes describing the complexity of the parental experiences of a PICU admission. The subthemes present a systematic and thematic basis for the development of a quantitative instrument to measure parental experiences and satisfaction with care. The findings of this study have important clinical implications related to the deeper understanding of parental experiences and improving family-centered care.